Because they could (will) come back and say "oh I bid you cabinets as contractor grade...you wanted custom?

“Not fixing up” to me means fresh paint, carpet cleaning and replacement with Allura only if cleaning fails, under $2/sqft porcelain tile in bathrooms only if existing tile is degraded, paint instead of replacing cabinets where I can, ReStore and Craigslist solid wood cabinetry when needed, ReStore and low end new appliances, not adding AC, not adding a new bathroom but replacing faucets as needed/able (around tenants) with Moen  and low flow fixtures, not adding a bathroom, not supplying a dryer, granite tile counters, solid wood doors replacing existing doors as needed rather than replacing all at once, etc. 

I recently refinished kitchen cabinets for the first time.  

-Repainted kitchen and cabinets.

They even make clear little ones for cabinets and the like. 

New cabinets, floors, paint, ceiling fans, doors etc.

ALL NEW INSULATION, NEW SIDING, NEW PLUMBING, NEW HVAC, NEW ELECTRIC, NEW WINDOWS, NEW WRAPAROUND BALCONY, NEW STAIRS, NEW DRIVEWAY, NEW COUNTERTOPS, NEW CABINETS, NEW APPLIANCES.....ON SITE GAS METER.....THIS PROPERTY HAS A MILLION DOLLAR VIEW AND VIEWS OF THE LAKE FROM ALL ROOMS.

NEW kitchen with NEW white Shaker cabinets AND quartz countertops, NEW wood laminate flooring, UPDATED bathrooms with NEW matching white Shaker cabinets, NEW plumbing, NEW bathtub, shower and tiled floors, All NEW drywall, NEW electrical panel, NEW electrical wiring, NEW siding, NEW windows, NEW roof, FRESH landscaping front side and back. ...

He also wants to charge me for the inside of the cabinets that seem to have some oil-like stains  where my canned goods were.

I have a house I’m rehabbing with very high quality wood cabinets, built-ins, and vanities.